Type-writing machine.



M.; H! Locxwoon. TYPE-WRITING MACHINE. APPLICATION FILED JULY 7, 1910.

Patent-ea @11.24, 1911'.

2 SHEETS-SHEET 1.

mmra /1 TTU/MIE YS WTNESSES:

MH. LOCKWOOD. TYPE WRITING MACHINE. APPLIOATIQH HLBD JULY 7, 1910.

1,006,489. Patented @en 24, 191.1.-

ZIBEEBTS-SHEBT 2.

WITH. 2f v WITH?. '2f

UNITED PATENT oEEIcE.

MARQUIS H. LOCKWOOD, 0F NEW YORK, N. Y., ASSIGNOR T0 UNDERWOODTYPEWRITER COMPANY, 0F NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TYPE-WRITING MACHINE.

Specification of LettersPatent.

Application filed July 7, 1910. Serial No. 570,732.

To all w/Lom t may concern:

Be it knownthat I, MARQUIS H. Loon- WOoD, residing inthe borough ofManhattan, city, county, and State of New-York, have invented certainnew and useful Improvements in Type-Writing Machines, of which thefollowing is a full, clear, and exact description, suchas will enableothers skilled in the art to which it appertains to make and vuse thesame.

My invention relates particularly to escapement mechanisms and is hereshown applied to the well known Underwood type` writer, which at presentemploys an escapement mechanism wherein a fixed and loose dog are used;the coacting parts conforming in shape and function to the dogs and rackteeth as shown and described in the Dyett Patent, No. 673,426. I proposeto `employ two fixed dogs on an independently mounted dog rocker inconnection with a universal bar mechanism which releases the escapementlby means of a hammer `blowy which is delivered at the upper end of thedog rocker. y

By this hammer blow, the normally holding dog is whipped out of the rackwhereby the rack and carriage are released instantly when the type isvery near the printing point and the printing will be done before thecarriage has had time to move a percep- `tible`amount. After printing,the typebar move in unison with the universal-bar mechanism on itsreturn stroke v and hence the back of the normally engaging dog mayslide down the back of a tooth of theescapement wheel when the carriagedoes not move fast enough as ypointed out later and showndiagrammatically in some of lthe .figures The `object of myimprovementis to reduce the number of working parts in the escapementand provide a simple and etlicient typewriter escapement which may beoperated satisfactorily either by high speed or by slow speed operators.

Figure 1 represents a vertical section of the key action, universal barand my escapement mechanism; Figs. 2 to 7 inclusive showdiagrammatically the consecutlve steps in the operation of theescapement dogs and rack; Fig.. 8 is a View of the dog rocker andescapement wheel in elevation; Fig. y9. is another view similar to Fig.1 butin which the -escapement is operated without the dog rocker spring;Figs. 10 to 12 .inclusive show diagrammatically the operation of -aInodication; and Figs. 13 to 15 inclusive diagrammatic views of adifferent mode 0foperation.

Similar parts throughout thespeciication and drawings.

In the drawings, 1 represents the platen; 2 the typebar, pivoted in the`hanger bracket 3. The typebar is operated by the key 4 through theintermediate bell crank leverl 5.v

In operation, the heel 2a of the type bar strikes the universal bar 6which is attached to a reciprocating frame 7 the front end ofl whichcarries the bar extension 8-4 which slides in a slot in the `bracket;3.. The other end of theV fra-me 7 -is pivotally `secured to the arms 9by the transverse rod 9a. The arms 9 aresecured to the rockshaft 10,thereby permitting the frame 7 to reciprocate back and forth ashereinafter explained. The reciyn'ocating frame 7 bears an enlargementat 1l which serves as a hammer to actuate the dog rockerin the mannervand for the purpose hereinafter described. Theuni- `versal bar 6 andframe 7 are heldin and returned tothe forward initial posit-ion by meansof the spring 12, one end o f which vis secured to the frame A7 `and theother to-a post 13 secured to the frame bracket 14. Independentlymounted in bracket 14 for vibration transversely with respect to theletters'of reference refer to li-ke held under tension toward the frontor to-v ward the right in Fig. 1 by the spring 19 the .motaonfof the"dog rocker being limited in this direction bythe head of the screw 18,Thespring 19 may be dispensedwith when-- the: escapement operates in themanner hereinafter'described.

l have provided thei upper` end of the dogjrocker with two xeddogs v2Oand 21,

spaced apart and separated by an angularV channel'for the'passageof atooth 22 of the escapement rack or wheel. 23 which is revvolulvly-mounted 1n 'the bearing 24, and' is driven 'the usual mannerfrom ythe power driven 'carriage carrying-thel platen 1. The relativepositions ofthe two fixed dogs 20 and21`isshown in the diagrams Figs. 2to 7.,. and -10 to v'15, inclusive.

4o; a y

the modification representedin Fig," 9,

the dog rocker returning s'pring '19,. as showni. yin Fig. 1,'h'asbeenremoved and the dog I tfwill'b''seen that the angular channelbetween-ithe dogs is formed by beveling the innerc'or'ner of thef dog2121s 21a, the angle being- ,substantially 45?, although it may beI'ariedtosuit the requirements; thus providingeachdogwith a singleworking Vface opnosed'to the-forward' movement of the rack.

O'ne corner of each rack tooth 22'is beveled at'22a practically parallel to and atthe same angle. as the bevel 2.15ct' the dog 21; -thusprovidinggthe; .working face ofeach tooth l'with 'a;straight"j-portionand-an angular portion-:Whichicooperate respectively with thestraight'ffa'ce .of the dog'20 andthe angular face of the dog 21 inamanner hereinafter described;

rocker isreturnedto normal position, when the-machine' is operated, bythe impact or .camming action of the angular face 22?i of a tooth of therackagainst the cam face 21a oflthe. normally disengaged fixed dog.rlhis operation-of the'escapement is diagrammatically illustrated inFigs. 13 to 15 wherein Fig. 1 3' represents the dogs and rack in normalposition Fig. 14 represents the dogs at the endof the releasingtransversemotion, thel rack .tooth being shown out of contact ,with

either dog since the rack remains practically stationary during 4theinstant of p rmtmg, 'dueto the inertia of the heavy carriage; in

Fig. 15 the rack tooth 22 is represented as in contact with and slidingdown the cam face 21a' and thereby forcing the dog rocker back Atowardthe normal position as shown in Fig. 13. When thus operatedwithout'thespring to return the dog rocker and hold it in normal"osition, there is a possibility of accidenta displacement, though thisis .not

Localice likely, nevertheless to provide a means of retaining the dogrocker in its normal position. when the rack rests on the plain face ofthe dog 2Q, the head 'of the screw 16 may be i allowed to proj ectfarenough to contact with the transverse rod 9a which secures the rock arms9 to the universal reciprocating frame 7 which will prevent movement ofthe dog rocker until the universal frame 7 is moved.

In Figs. 10 to v15 inclusive, the shape of the teeth of the rack isshown as modified by having the back corners removed at an angle "sothat the plane 21.b thus4 formed is practically parallel to the angularface 21, previously mentioned.' Removing the corner of the teeth in thismanner, makes it possible to reduce .l the amount of drop between theworking faces of the two fixed dogs and thereby permit the dog rocker tobegin its `return to'normal position sooner than with the otherconstruction. The operation of the escapement will vary accord- .ing tothey speed and style of stroke used by the operator, but at all speedsof operation the printing will be done so-quickly after therearfofjhedog 20 'as' 20aand the forward'.

release of the rack tooth 22 from the plain faced dog 20 that thecarriage is practically lat rest and the parts will be in the positionhead 11 on the universal reciprocating frame 7 will get away fromcontact with the point of the screw 16 so as to permit'of the positionof par-ts represented in Fig. 4, because the rack has not had time tomove a 'perceptible amount owing to the inertia of ,the carriage; afterwhich, as the rack advances,

the continued pull of the dog rocker spring 19 will cause the bevel 20aon the back of the dog to follow the back of a rack tooth 22 asindicated in Figs. 5, 6 and 12, and during this operation, owing to theangular face 20 tends to force the rack ahead and thus speed thecarriage along, after which the rack and dogs return to normal positionready for the operation to be repeated.

' When the keys are operated slowly or when the spring 19 is removed theparts during the various steps will assume the positions shown in theFigs. 13, 14 and 1'5 in whchthe power of the moving rack tooth is usedto restore the dog rocker to normal. In actual practice I' find that thedevice works satisfactorily either with or without the spring 19.

, It will be understood that other modifications of the dev-ice may bemade and still with other machines and other key actions therefore I donot wish to be limited to thel construction shown.

l plane of movementf of said dog rocker and t, prising a dog rockerprovided with two fixed vzo dogs each with a single working face, theworking face of one dog being parallel to the the working face of theother dog being at :an angle to said plane, a rackvarranged to travel'transversely to the plane of movement of the dog rocker, teeth on 'saidrack each having a. working face consisting of two portions, one astraightportion parallel to and adapted to contact only withl the doghaving its working f ace parallel to the plane of movement of the dogrocker and the other a straight portion at an` angle to the firstportion and adapted to Contact lonly with the dog havin its working faceat an angle l' to the plane o movement of the dog. rocker. f 3.0

A,3. An escapement for typewriters comprising a dog rocker rovided withtwo fixed a5 -at `all angle to'sald plane, a rack arranged to fli- 40dogs, each with a single working face, the 'working face of one dogbeing parallel to the plane of movement of said dog rocker and theworking face of the other d og being trgvel transversely to the plane ofmovement o1 tlfe dog rocker, teeth on said rack each having a working l-face provided "with straight portions parallel to and adapted tolcontact respectively with the corresponding working face ofs'aid dogs.

4J :An escapement I for typewriters' com-l prising a, dog rockerprovided with two fixed .do s, each with a single working face, thewoking face ofone dog bein in theplane of movement of the dog roc erwhile the working face of the other do is at an angle thereto and totheworking ace of the first named dog, a rack arranged to traveltransversely to theplane of movement of the'dog rocker,l teeth on saidrack each having a,

working face provided with a straight portion adapted to contact onlywith the dog having its working face in the plane of movement of t-hedogrockerv and normally hold the rack, and a straight portion at an angleto the'otherportion and adapted to contactonly with the dog having itsworking face at anvangle to the plane of movement of the dog rocken-andreturn the dog lrocker to normal position.

5. An escapelnent for typewriters comprising a dog-rocker mountedforindependpeut movement, two fixed y"dogs on said dog rockereach with'a single working face, one

at an angleV to the other and to the plane of movement of the dogrocker, a rack arranged to travel transversely to the plane 1 ofmovement of the dog rocker, teeth on said rack each having a workingface consisting of two portions each corresponding respectively with theworking face of the dog with which it is adapted to contact, and keyactuated means fory delivering a hammer blow to actuate said dog rocker.

6. An escapement for typewriters comprising -a dog rocker mounted forindependent movement, two fixed dogs on said dog rocker each having asingle working face,

yone parallel to the plane of movement of the dog rocker and one atanangle to the n otherV working face and to said plane of movement ofthe dog rocker, a rack arranged to travel transversely to the plane ofmovement of the dog rocker, teeth on said lrackl each having a workingface consisting of two portions, one portion being parallel to andadapted to engage only the dog having its working face parallel to theplane Vof movement to the dog rocker to normally hold the rack, whilethe other portion is at an angle to the first named portion and adaptedto engage the dog having its working face at an angle to the plane ofmovement of the dog rocker and restore the dog rocker to normalposition, and key actuated means for delivermg a hammer blowvto move thedog. rocker away' from normal position.

7. An escapement for typewriters comprising a rack provided with teeth,each havinga working face provided with two straight portions at anangle to each other, v

a dog rocker mounted to rock transversely to said rack, two fixed dogson said dog rocker, each provided with a single working face,

one at an angle to the other and to the plane of movement of the dogrocker, each dog adapted to be engaged only by the corresponding portionof the working face lof a tooth.

8. An escapement for typewriters comprising a, rack provided with teeth,each having a working'face provided with two straight portions at anangle to each other,

.a dog .rocker independently mounted to rock transversely to said rack,two fixed dogs on said dog rocker each provided with a single workingface, one atan angle to the other and to the plane of. movement ofthedog rocker, each adapted tob be engaged respectively only by thecorresponding portion of the working face of a tooth, andkey actuatedmeans for delivering a hammer blow to actuate the dog rocker in onedirection'.

9. An escapement mechanism for typewriters comprising a rack, a' pivoteddog v lrocker independently mounted .to rock transversely to said rackprovided with two fixed dogs in operable relation to said rack, .key

actuatedmeans Ior actuating-said dog rocker ln testimony whereof I havehereunto set in one direction, means for returning said my hand in thepresence of two subscribing dog rocker to normal position independentlyWitnesses.

of said key actuatedk means, and means :1ct- MRQUIS H. LOCKVVOOD. 5 ingin conjunction with said key actuated Witnesses: I

means for locking said'flog rocker in normal JOHN A. KEHLENBECK,

position. l A FRITZ ZmGLER, Jr.

